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https://issues.apache.org/jira/browse/CALCITE-6008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17767410#comment-17767410
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Julian Hyde commented on CALCITE-6008:
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Please ask for reviewers on the dev list.
> ARRAY_AGG should returns ARRAY NULL when there's no input rows
> --------------------------------------------------------------
>
> Key: CALCITE-6008
> URL: https://issues.apache.org/jira/browse/CALCITE-6008
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.35.0
> Reporter: Jiabao Sun
> Assignee: Jiabao Sun
> Priority: Major
> Labels: pull-request-available
>
> ARRAY_AGG in BigQuery and Postgres returns NULL if there are zero input rows
> or expression evaluates to NULL for all rows.
> However, it will return `ARRAY<arg0> NOT NULL` in the return type of the
> function definition.
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/aggregate_functions#array_agg]
> [https://www.postgresql.org/docs/8.4/functions-aggregate.html]
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